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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b904f343f81b832b2a51938f3f6028b1913515efde3e1d72952beb4dcc24ca9e' 
  AND token = 'g8Fu2WFiY61I8FzoTOsp8+3v3g64QSm34ePwDft5/eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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