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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71e10a64e2a6cf2d7cf469b795753c0b90920d4b5b7a5e1e97b35a5da953df4' 
  AND token = 'Zltw4HRX4pZyskRZ1V0/ctjF1tQqTnUnQC8BSTyQlOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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