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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f10e223a4fe875c3c4d3915051fe21c817d5c06bd5c4ee605bd3b209d2f7a2e' 
  AND token = 'PQMBggN9nM6VL37cRcD+/O/Yot+xzia/NQ9JPPE6zMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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