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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52cd8ef161303666af61062f08b4f35a2215ef4b065e0c13af64be3fb0a9975f' 
  AND token = '3AsrQr9ykXc1CnR3ky7Z9rrr6MehTmv3S3rIPOHQb1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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