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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '175528246b3af47863d0e21ad12240d8a2854e249ef69d8f599aba00dff31b95' 
  AND token = 'haBeZHrLTTm5IT1jdqTxEv2Fhi6OQiegFMNY8rNE/mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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