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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '614e1f1f6fad81c6cd4f6de9a8b95f8e5a358ed3ce67deb9742c14363e3aaeb6' 
  AND token = 'c32IxcHAMLKptHOnz9UMt2ZTvp+r6me8/FjYWeoV1cs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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