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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd6f76a30785e33b4caaf2d77f7a40cb5172bb6a6069af3e99f2141fe1b3a866' 
  AND token = '6k/jW/Cj1q29X/SyA5BSpFRKiwDEcDkAlyIVgV/7tAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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