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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7bec177823bc5d7f1c7c1cd194e8d8302306c18cf1567eaec4c14e8e49b6b58' 
  AND token = 'kR5oK487I8T3/G58B9+UUWDyMoSxV/alnPnJcEeo3Sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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