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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4a4711ba9073f5c2426ee1aa5bcaf3ef043be8b1309e8905ea77c0d58954de3' 
  AND token = 'd3mjt5iILJdEsN18ymtWB2AHBkcAUoXKA5nD0exYl+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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