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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5531259612488f2402da3f91f7cad5037d7e8616abd723f09ab8883ef1ec66c' 
  AND token = 'RL+ysPSu4SRVqQ3VWPjqRpsKKDDX2U53AV11n3FF6S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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