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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2259d56cc407bd7ae49d9b506493fe03d713c1c7786db0270278e28d5f956c33' 
  AND token = 'qyJJrHMc42cDkmUlWvOiH4VQ+Ang0P8OGU7BhMHy2MM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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