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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a55b58f84a750791f6cc4f5663957285eb4aa4d0d7faf0070ebeb3fa7f7ac6d' 
  AND token = '/EWPP7qNove3iY1vlb6sK5WGj0RBk1epD9ZLtDQKbRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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