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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ee3bf4fe8268d18439f1d202b63cae0516bbb29d53fc3c7bcd73e8ba0657f77' 
  AND token = 'Si8WnCSyN0pz3oMk3oP5IX/wrzI7llS1ESiR/AF43t8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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