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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d4404b492531f11343a728b36933fb8db642c51d6b1bda7396ad67b6f91b674' 
  AND token = 'eYTTHCBRG3G/eI1AIrkjvtWaH0uADfgCWRMD7UXpn2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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