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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52d8c37e73509ecf9e601e4658c1928d4636dd09aa337a66361dbd828c713a2a' 
  AND token = 'r9Aasptm4nt5DQxxp32lvl0Go9OS4bczCexrA0NfCx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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