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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f5aac49900e12a7efbebc61c63b5dc102dfeb7ae325bc1f77d82f47d22a84e' 
  AND token = '0ZsE3Q1258Qwtll5BeNK+pgtwuXLGJMwV7KNaWGRMBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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