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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c53c0b9590337362517139c53cf65418845993f0bd466561813f023a9da9d12' 
  AND token = '4/CF7gKuVDriFbRWXFXqubRbMfW4cqoUDBvcTGiR61I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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