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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a233e49ce76f4aac6c40838fdb8cd638a40787d0051c2cbd8fd0f97e12ff6cb0' 
  AND token = 'tnYgetV4q44bKeTGT0j3yKk4stvDr5ARiaVfYmU1gjw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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