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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77ce930666aad649d5ac743b492e0d586fa2ec4822a983d89cdff3bc87a1880c' 
  AND token = 'Its5Fu1oQztCLeV48EB2Wu2VZgtQMWA+TIJocPYJ+r4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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