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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc25f4052e37b51abd99d377a28eda9f70427078d341d488decfbfdff85c4b05' 
  AND token = 'EjKZfRhyVD04iC5d/ueCddLa7v+lK1u+olQncTEJlmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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