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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '751ea9f4f9aa1ebe92eda78c0512681f480a708d85d8d3450fe50c25968cfae1' 
  AND token = '/PKgNsNkWKGW/fLBt9iEF+olTuUXVeod/OVa3rurIS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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