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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d34db183b752c98e06574c01e2d1151ffcb96569bb2165870ac76cad45e310' 
  AND token = '5p8KC3MVeVBRxMqcwkW8IIp1/unInKBN0eEXV/NQTQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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