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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a30d34383fd5fb44ce413ca012593cb9f92b283321b9171bb97b01b2c4beae3' 
  AND token = 'WXdddISKbJ327452X82jDojt2Ft+Mnjx3eodJgejSbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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