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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e40575ff54fd4bfb62ceb5d0a755acdffaa9264dec043f4f3d66c8a31ba1839' 
  AND token = 'RmoYr3w3VKMuOlSBQjSuhKClXkE9/oTIN+2+DMohw6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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