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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e2565f47c1c75b438dcfcd702b8e0b9d2662348a24fae750fe5e9456536a81a' 
  AND token = 'cuL9u4kWpXps3Iuv34xe+oyh1/ev/2FGr92OABYp4Qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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