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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36126968612bd7653e6f9c7296b409eba9381e1a0437e7f1e72db3550bf9279' 
  AND token = 'yMpnX1pRGDsI2qDhsq3LRKHjsCNXM6XfeX1zq6aqgqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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