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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6d109cf148cc75122b1d7263c4010c82beef3bcb1709189b765fdab4ac8a5ba' 
  AND token = 'XBEWE9JNEppMzKtzhP5IvWsr0mv23MKayD3KXH+OAKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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