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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25b0c8c84ba2ab4276cf2ac79a0b6e412b4d1f0f6327e4f56abdaae32d3311a9' 
  AND token = 'Ebprrpwd8eMxrR37WVZA09EYT7FbDJynRxkRLc5Q95g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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