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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bf42401c3cb11fec9710ce2ef163b937a1870eb345d737f7f99ad66f91727e9' 
  AND token = 'cxjQToxp20jNY3yKdOQ55Xz2lVMbA55qf/wE1B+0VXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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