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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bee96ad56f4eeb9ea6d4322b2ac18b424d7e411af78fe7d5d48991759bf1967' 
  AND token = 'mOgjcr4kVLfpKxc6hrodrh+WbYHxQoh2+Igx0ezX3z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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