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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6e5c0e713005112f5633f9a8575378c19e824ec7283bfd23bf26b1aed8bd3f7' 
  AND token = 'JnECb7p55J8q3Kng7sfrf4Q2LpTNFv2NOa93flbkIwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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