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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f9dde18907d375f30e47c5b170d32dc7c5f402362343255ee14f6cf0c56daa4' 
  AND token = 'EIls7GDp26Gb4h0te3JfERYszyrMjIUVSft9suqDYSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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