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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff362df379f006c50054671ff26001911bb6ffa120f5875f9c41aa9db1d521f0' 
  AND token = 'D0iwKcZzMg+W6y3aupBLl+NHh2GA4H4GG5PPloMqXTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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