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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ba3f6440331309cd8f1257b2102d7d6f8f34ac25a19853c5c3a427fb2dd8ba2' 
  AND token = 'JucQzzJHob8g42OxCXJA9AQY7Y9cm+nCpcarC4+KKYA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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