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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be79c2a4397307b87e2cdd54d2dbefccf3a98c622223bc09544163af5ac598c1' 
  AND token = 'ZbHDF2QPfB2CIYSNuS0TsnOAKGqKKcSyJ829i6pd9YE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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