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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2b0b98e9f0cd4ef9ee6027963479a1c2d07743b99de3effb7b8a8a3fcf1b553' 
  AND token = 'PgGEAvdfIXPtBPbgK7rJckRCfXMcp6wasloZzY6J09o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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