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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93a96f5084c12508c749f406f753aefbba755088632778d0c9acbac28d4f0c03' 
  AND token = 'lus2vFBfpvYAi7ujQvuEqo5B6xASdIh1uQAsr3985fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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