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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee113d9b595dafc9eba122a7e5592543249bad29d7288de8c4bce3f8759e044f' 
  AND token = 'E9jniygMjQIcQ/dRoD8WtKjVNPQ1n8md3F4A6DUZwUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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