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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b18ead3281891cb7d4b1d18e895770179ccb9364a9f684bffec0d0562df348dc' 
  AND token = 'IUOT/cM/EfvBYrwJi5IMY3wxQtoXE72+CJJyFaZb044=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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