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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '389f35714a0b3e67d672869b0c0df41fab450676e62bc4de4bf7909ddf4fb921' 
  AND token = 'y9LUT5TN2KiuSf4ZSDz7YyUO0nGllzTFGZu3dzopejc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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