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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38d4164db59b2555ecf7034da588c8ac84c7c19ad12e9f59ed423df677d4855' 
  AND token = 'u373m3G5Ei3CVrnwEsssKYRh2DSAFySaVDBtZdw5o+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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