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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65f19aa056f47edcf10541f0a142d4f4e934e948e2001b05bbcebfb0a70cdf18' 
  AND token = 'IehrZMWlsBSdrGVki7u2iNU1tfx3bXBCQyN4TZfFg8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}