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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc8bef9ef789dddab9d0df04a652527a47d401d95ff5d4c6319b7c6198d6312' 
  AND token = '5r0eUUwb9OhjfSr1N0Yzg+cKqkigWeXZs41knZk5RIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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