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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa9066021abacb3d06346616187e40813281b0a983960bc549775622ef2f870d' 
  AND token = 'IrdobApPJ20HGoLAiJI7o6h79JUuVLLRXYEO8axt8qE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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