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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '768036ee46a87e35db51e48894fb296a068be5f63849949d8ffe23d5a2b319d7' 
  AND token = '5VsLdyqNRmmwnyKer8jJHMKlbAFXOk5MCCe5YefWLEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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