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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c8fd6bcb0d2f31485c1bc31f762acfe9185d4f635f09fb573c8bd14fea8e31' 
  AND token = 'YbebbHEoT+Rah8c+/8IXKIN38HpPMvGaSfdZ6aUo55g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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