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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '199d57a70794300301858ab6733ef2c92cb635988e9cafc250d888406da97d2e' 
  AND token = '6x2ASuzXtqUx1Mn6u3vg96EKWGusT42VC+b0QrePES4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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