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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f80fcef570fe78a0ea67e848d3c2eab567648bc588b36431ca7b871b47314d03' 
  AND token = 'c048RBAzcXGznW98CmQ4PFVV5OUr+kAy8UeTrRc6p2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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